What is the most important photo you wan't to shot when your on the plane?

This photo on Air Malta 9H-AEQ in Sicily Airspace you can see the moon in the background. I wish I like to film a sunset or sunrise with the sky colour changed but it did kinda happen to this next photo.

This one on board Air Malta 9H-AEO descending to London Gatwick at 10:20am weather forecast a pretty cloudy but when I landed in Gatwick the weather turned out nice with strong sun light!

Maybe you are interested try to and spot another plane in mid air and take photos and identify what airline it is. The problem is it's very difficult to zoom the camera and try to find where the plane is even you don't know what the registration is you can always go on FlightRadar24 and find out what it is. 

This photo is Emirates I don't know if it's Emirates Sky Cargo or just Emirates it self taken 30th January 2013.

Maybe you are interested seeing the view of other countries and take photos the the mountains between France and Switzerland.

 Or this one here on board Ryanair EI-EVC taken 26th July 2012. This photo was taken early morning departed Malta on Ryanair flight FR8742 to Bournemouth but what you see is Sicily in the background.

And finally you wan't to take photos while the plane is on the ground. This photo here was on Air Malta 9H-AEO again but in Apron 8 which is located infront the Air Malta Hanger and old former terminal building now currently used as cargo centre.